Question

You were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the second equation is substituted into the first equation. 2x-7y=4 3x+y=-17

Answer 1

2(-17-y)/3 -7y = 4

Explanation:

Solving the second equation for x, we get ...

3x = -17 -y . . . . subtract y

x = (-17 -y)/3 . . . divide by the x-coefficient

Substituting this for x in the first equation gives ...

2(-17-y)/3 -7y = 4

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Comment on this problem

If I were solving this by substitution, I'd substitute for y, not x. That way, fractions could be avoided.